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Shi Z, Wang J, Li M, Gu L, Xu Z, Zhai X, Zhou S, Zhao J, Gu L, Chen L, Ju L, Zhou B, Hua H. Protective autophagy enhances antistress ability through AMPK/ULK1 signaling pathway in human immortalized keratinocytes. Cell Biol Int 2024. [PMID: 38436129 DOI: 10.1002/cbin.12149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 01/09/2024] [Accepted: 02/17/2024] [Indexed: 03/05/2024]
Abstract
Keratinocytes, located in the outermost layer of human skin, are pivotal cells to resist environmental damage. Cellular autophagy plays a critical role in eliminating damaged organelles and maintaining skin cell homeostasis. Low-dose 5-Aminolevulinic acid photodynamic therapy (ALA-PDT) has been demonstrated to enhance skin's antistress ability; however, the regulatory mechanisms of autophagy in keratinocytes remain unclear. In this study, we treated immortalized human keratinocytes (HaCaT cells) with low-dose ALA-PDT (0.5 mmol/L, 3 J/cm2 ). Through RNA-sequencing analysis, we identified that low-dose ALA-PDT modulated autophagy-related pathways in keratinocytes and pinpointed Unc-51-like kinase 1 (ULK1) as a key gene involved. Western blot results revealed that low-dose ALA-PDT treatment upregulated the expression of autophagy-related proteins Beclin-1 and LC3-II/LC3-I ratio. Notably, low-dose ALA-PDT regulated autophagy by inducing an appropriate level of reactive oxygen species (ROS), transiently reducing mitochondrial membrane potential, and decreasing adenosine triphosphate production; all these processes functioned on the AMP-activated protein kinase (AMPK)/ULK1 pathway to activate autophagy. Finally, we simulated external environmental damage using ultraviolet B (UVB) at a dose of 60 mJ/cm2 and observed that low-dose ALA-PDT mitigated UVB-induced cell apoptosis; however, this protective effect was reversed when using the autophagy inhibitor 3-methyladenine. Overall, these findings highlight how low-dose ALA-PDT enhances antistress ability in HaCaT cells through controlling ROS generation and activating the AMPK/ULK1 pathway to arouse cellular autophagy.
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Affiliation(s)
- Zhinan Shi
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
- Medical School of Nantong University, Nantong, China
| | - Jing Wang
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
- Medical School of Nantong University, Nantong, China
| | - Min Li
- Department of Integrated Chinese and Western Medicine, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Li Gu
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Zhiyi Xu
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
- Medical School of Nantong University, Nantong, China
| | - Xiaoyu Zhai
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
- Medical School of Nantong University, Nantong, China
| | - Shu Zhou
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Jingting Zhao
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Liqun Gu
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Lin Chen
- Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Linling Ju
- Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
| | - Bingrong Zhou
- Department of Dermatology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Hui Hua
- Department of Dermatology, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong, China
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